My friend has an old house in Boston with high heating bills during the cold winter months. I experimented with my Ryobi PhoneWorks Inspection scope see what kind of insulation was in his walls. I used my PhoneWorks thermometer to see how adding expending insulation would impact the performance of the room. The interior surface temperature of the wall before I added insulation was about 63 degrees. It took me about 10 minutes to add insulation to a 2 foot section of the wall and afterwards the interior surface was about 68 degrees. You should consult with a qualified construction professional before impacting your building envelope. Expanding foam should be used with caution. Too much foam can occasional warp window frames. It is a great insulator but should not be used near fireplaces or other points of combustion.
Step 1: Scan walls looking for insulation weak spots.
I used the Infrared thermometer to look at the surface temperature of the wall. Cold spots tell me where there is little thermal resistance between the interior and exterior.
Step 2: Drill a Hole through the drywall
I drilled a ½” diameter hole just through the drywall. This hole will let me poke the Inspection scope through and see inside the wall.
Step 3: Inspect
I used to the inspection scope to look inside the wall. I moved it all around and found that there was virtually no insulation in the wall. I was also able to see what the structure of the windowsill looked like. Everything was pretty solid and I didn’t see any exposed old wires so I decided to add spray foam.
Step 4: Spray Foam
I used Greatstuff brand spray foam to fill up the wall cavity. This is a messy product and expands rapidly to fill all gaps and crevices in the wall.
Step 5: Patch the holes
Once the spray foam had fully expanded and dried I sealed the holes with putty.
Step 6: Test
I used the Infrared Thermometer to scan the wall again and found that they were now significantly warmer than before due to the added insulation.